Help me please, with Spring tag

[Steam]

This is my first experience with Spring. When I was reading the “Spring Live” all worked Ok. Equinox works well too. But in my project I have strange problem with binding. And I don’t see the difference between book example and my project.

There is filePersonList.jsp with one and very easy form which contains one input tag only:

<form method="post" action="<c&#58;url value="/filePersonList.html"/>" name="searchParametersForm">
    <table class="search-panel-form" width="100%" cellpadding="0" cellspacing="0">
        <tr>
            <th>Text&#58;</th>
            <td>
                <spring&#58;bind path="searchParameters.field">
                <input type="text" name="field" id="field" value="$&#123;status.value&#125;"/>
                <span class="fieldError">$&#123;status.errorMessage&#125;</span>
                </spring&#58;bind>
            </td>
        </tr>
        <tr>
            <td class="search-panel-button-cell">
                <input name="start" class="panel-button" type="submit" value="Start">
            </td>
            <td class="search-panel-button-cell">
                <input name="clear" class="panel-button" type="submit" value="Clear">
            </td>
        </tr>
    </table>
</form>

I use the “searchParameters” as command object for the form. The class SearchParameters has all needed fields:

public class SearchParameters extends BaseObject 
{
    private String field;
    public String getField()
    {
        return field;
    }

    public void setField( String field )
    {
        this.field = field;
    }
}

There is information about it in the action-servlet.xml

<bean id="filePersonListController"class="com.company.web.FilePersonListController">
        <property name="commandName"><value>searchParameters</value></property>
        <property name="commandClass"><value> com.company.web.SearchParameters</value></property>
        <property name="formView"><value>filePersonList</value></property>
        <property name="successView"><value>redirect&#58;filePersonList.html</value></property>
</bean>

And sure, I have the class FilePersonListController with implemented formBackingObject method

public class FilePersonListController extends SimpleFormController
{
    private static Log log = LogFactory.getLog( FilePersonListController.class );

    public ModelAndView onSubmit{...};

    protected Object formBackingObject( HttpServletRequest request ) throws ServletException
    {
        log.debug( "CALL - new SearchParameters()" );
        return new SearchParameters();
    }
}

I can see my form well while I don’t use the spring:bind. Something like that:

<input type="text" name="field" id="field" value="111"/>

When I add the binding I have exception:
The exception is:

javax.servlet.jsp.JspTagException: Neither Errors instance nor plain target object for bean name 'searchParameters' available as request attribute at org.springframework.web.servlet.tags.BindTag.doStartTagInternal(BindTag.java:108)
	at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:71)
	at org.apache.jsp.filePersonList_jsp._jspService(org.apache.jsp.filePersonList_jsp:101)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:39)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at com.company.web.MessageFilter.doFilter(MessageFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:97)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:247)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:839)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:616)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:543)
	at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(FrameworkServlet.java:390)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:350)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at com.company.web.MessageFilter.doFilter(MessageFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:595)

Could you help me? What I did wrong? I use JDK 1.5, Spring 1.1.4, Tomcat 5.5.9
Thanks in advance.

[katentim]

Try adding setCommandName("searchParameters"); to your FilePersonListController constructor.

[Steam]

Thank you, katentim, for your answer.

I found out where was a problem. The problem was with relation between jsp and controller. According to my scenario I need to go from formOne to formTwo (after submission). In my method onSubmit for formOne’s controller I used:

return new ModelAndView( getSuccessView(), model );

According to examples I should use (to avoid doubling submit):

return new ModelAndView( new RedirectView( getSuccessView() ), model );

When I tune my urlMapping it starts to work. Unfortunately, with RedirectView I can’t use 'model' in my next step JSP directly. I have to pass arguments by using request parameter and it is not so good for some object. It looks like I should use method formTwo-formBackingObject to process some operations and use command object to prepare JSP. May be there are other ways?

The “return new ModelAndView( getSuccessView(), model );” works fine if I go to the same form only. I feel, I don’t understand Spring’s mechanic well yet.